Winding arrangement for a tubular linear motor

Abstract

A tubular linear motor is provided having a secondary and a primary. The primary consists of a plurality of laminations and coils. Each lamination has a width with a plurality of notches removed therefrom, and a first end and second end, with a length extending therebetween. When the laminations are aligned, the notches collectively form channels which receive the coils. The plurality of coils are arranged in poles, each pole having a discrete number of coils corresponding to the number of phases in the current driving the linear motor, or a multiple thereof. A percentage of the coils corresponding to the phase closest to the first end of the primary, is positioned at the second end of the primary.

We claim: 
     
       1. A linear motor driven by an electrical current having a number of phases, comprising: a secondary; and   a primary, having a plurality of coils and thin laminations, each lamination having a width with a plurality of notches removed therefrom, a first end and a second end, and a length therebetween, wherein when said laminations are aligned, said notches collectively form channels for receiving said coils;   wherein said plurality of coils are arranged in poles, each pole having a discrete number of coils corresponding to the number of phases in the current driving the linear motor, or a multiple thereof, and wherein a percentage of said coils corresponding to the phase closest to said first end, are positioned at said second end of said primary.   
     
     
       2. A linear motor according to claim 1, wherein said percentage of said coils corresponding to the phase closest to said first end, positioned at said second end of said primary, is equal to fifty percent. 
     
     
       3. A tubular linear motor driven by an electrical current having a number of phases, comprising: a secondary; and   a primary, having a plurality of coils and thin laminations, each lamination having a width with a plurality of notches removed therefrom, a first end and a second end, and a length therebetween, wherein when said laminations are aligned, said notches collectively form channels for receiving said coils;   wherein said plurality of coils are arranged in poles, each pole having a discrete number of coils corresponding to the number of phases in the current driving the linear motor, or a multiple thereof, and wherein a percentage of said coils corresponding to the phase closest to said first end, are positioned at said second end of said primary.   
     
     
       4. A tubular linear motor according to claim 3, wherein said percentage of said coils corresponding to the phase closest to said first end, positioned at said second end of said primary, is equal to fifty percent. 
     
     
       5. A method for arranging the primary coils of a tubular linear motor driven by an electrical current having a number of phases, comprising the steps of: providing a primary having a plurality of coils and thin laminations, each lamination having a width with a plurality of notches removed therefrom, a first end and a second end, and a length therebetween, wherein when said laminations are aligned, said notches collectively form channels for receiving said coils;   arranging said coils in poles, each pole having a discrete number of coils corresponding to the number of phases in the current driving the linear motor, or a multiple thereof; and   positioning a percentage of said coils corresponding to the phase closest to said first end at said second end of said primary.   
     
     
       6. A tubular linear motor primary comprising: a body, having a plurality of notches disposed sequentially therein from a first notch to a last notch; and   a plurality of coils, each of said coils being disposed within a notch, each of said coils capable of creating a magnetic field of a given magnitude, a first coil disposed in said first notch and a second coil disposed in said last notch, said first and second coils each having a magnitude of a percentage less than one hundred percent of said given magnitude.   
     
     
       7. A tubular linear motor primary comprising: a body, having a plurality of notches disposed sequentially therein from a first notch to a last notch; and   a plurality of coils, each of said coils being disposed within a notch, each of said coils capable of creating a magnetic field of a given magnitude, a coil disposed in said first notch, said coil having a magnitude of a percentage less than one hundred percent of said given magnitude.